IR6141 in soil is degraded via oxidative and hydrolytic processes under aerobic conditions and most probably under anaerobic conditions too, based on the experimental data on benalaxyl. Compounds methyl-N-(2,6-xylyl)-N-malonyl alaninate (M7), methyl-N-(2,6-xylyl)-N-malonyl alanine (M3) and IR6141 acid (M9) are the major metabolites formed with maximums of ca 15% to 24%AR under aerobic laboratory conditions. No carbon dioxide was detected as a result of benalaxyl degradation whereas maximums of 7%AR were released from the metabolism of IR6141. From the degradation of M7 and M3 ca 25%AR were released as 14CO2 whereas from metabolism of M9 only 6%AR were identified as CO2. M3 was the major degradation product of M7 metabolism in soil indicating that M7 is a percursor of M3 formation. Also, M3 was the main metabolite formed from M9 degradation. Under laboratory relevant aerobic conditions DT50 (1st order) values ranged from 36 to 124 days with a mean value of ca 70 days. This mean half life is also obtained from the degradation data with benalaxyl (DT50 of 36 to 100 days). The half life values of M7, M3 and M9 ranged respectively, from 49 to 90 days; 66 to 118 days and 5 to 13 days. DT90 values were estimated to be in the range of 165 to 430 days for M7; 217 to 1100 days for M3 and 11 to 45 days for M9.